Staser

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Staser pistol. (DW: The Invasion of Time)

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Staser rifle pointing at the Lord President of Gallifrey. (DW: The Deadly Assassin)

Staser weapons were the standard armament of the Chancellory Guard on Gallifrey. The Guards were normally equipped with staser pistols, although staser rifles were also occasionally used.

Stasers had both lethal and non-lethal settings. They were relatively non-damaging to inorganic matter but caused massive tissue disruption to living creatures. (DW: The Deadly Assassin)

As a result a single staser shot could apparently kill a Time Lord outright and ensure that regeneration could not take place.

A Staser rifle was used in the assassination of the Lord President by the Master. (DW: The Deadly Assassin)

Councillor Hedin used a staser to commit several murders on Gallifrey. A staser wielded by Commander Maxil was also used to stun The Doctor. (DW: "Arc of Infinity")

Stasers were ineffective against Sontaran armor. (DW: The Invasion of Time)

The Un-named Castellan kept a small staser hidden on his person, and was shot dead by security personnel whilst using it to attempt an escape during Borusa's Death Zone gambit. (DW: The Five Doctors)